The mean is the average value of the set. It is computed by adding all of the elements of the set, and then dividing that sum by the number of the items in the set.
The median is the central, or middle, value in the set. It is computed by sorting the set and picking out the middle item or, if the number of items in the set is even, then by computing the mean of the middle two items.
Not asked, but answered for completeness...
The mode is the most probable value of the set. It is computed by plotting a distribution of the frequency of occurrence of each value in the set, and selecting the value, or values, with the highest occurrence in the set.
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Measures of the center.
# Mean # Median # Mode
Mean, Median and Mode.
The commonest three are the mode, median and mean.
Measures of central tendency are the mean, median, range, mode ect.